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linux-stable/arch/arm64/include/asm
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Valentin Schneider 15e5d5b45b arch_topology, arm, arm64: define arch_scale_freq_invariant() 
arch_scale_freq_invariant() is used by schedutil to determine whether
the scheduler's load-tracking signals are frequency invariant. Its
definition is overridable, though by default it is hardcoded to 'true'
if arch_scale_freq_capacity() is defined ('false' otherwise).

This behaviour is not overridden on arm, arm64 and other users of the
generic arch topology driver, which is somewhat precarious:
arch_scale_freq_capacity() will always be defined, yet not all cpufreq
drivers are guaranteed to drive the frequency invariance scale factor
setting. In other words, the load-tracking signals may very well *not*
be frequency invariant.

Now that cpufreq can be queried on whether the current driver is driving
the Frequency Invariance (FI) scale setting, the current situation can
be improved. This combines the query of whether cpufreq supports the
setting of the frequency scale factor, with whether all online CPUs are
counter-based FI enabled.

While cpufreq FI enablement applies at system level, for all CPUs,
counter-based FI support could also be used for only a subset of CPUs to
set the invariance scale factor. Therefore, if cpufreq-based FI support
is present, we consider the system to be invariant. If missing, we
require all online CPUs to be counter-based FI enabled in order for the
full system to be considered invariant.

If the system ends up not being invariant, a new condition is needed in
the counter initialization code that disables all scale factor setting
based on counters.

Precedence of counters over cpufreq use is not important here. The
invariant status is only given to the system if all CPUs have at least
one method of setting the frequency scale factor.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-09-18 19:11:20 +02:00
..
vdso vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter() 2020-08-06 10:57:30 +02:00
xen xen: fixes and cleanups for 5.4-rc2 2019-10-04 11:13:09 -07:00
acenv.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
acpi.h arm64/acpi: disallow AML memory opregions to access kernel memory 2020-07-14 18:02:03 +01:00
alternative.h arm64/alternatives: move length validation inside the subsection 2020-07-30 16:50:14 +01:00
arch_gicv3.h KVM: arm64: Annotate hyp NMI-related functions as __always_inline 2020-06-22 14:39:45 +01:00
arch_timer.h arm64: arch_timer: Allow an workaround descriptor to disable compat vdso 2020-07-08 21:57:51 +01:00
archrandom.h random: random.h should include archrandom.h, not the other way around 2020-08-05 12:39:48 -07:00
arm-cci.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
arm_dsu_pmu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
asm-bug.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
asm-offsets.h
asm-prototypes.h arm64: asm-prototypes: Fix fat-fingered typo in comment 2019-01-10 11:11:46 +00:00
asm-uaccess.h arm64 updates for 5.5: 2019-11-25 15:39:19 -08:00
asm_pointer_auth.h arm64: simplify ptrauth initialization 2020-04-28 11:23:21 +01:00
assembler.h arm64: asm: Provide a mechanism for generating ELF note for BTI 2020-05-07 17:53:20 +01:00
atomic.h locking/atomic: Move ATOMIC_INIT into linux/types.h 2020-07-29 16:14:18 +02:00
atomic_ll_sc.h arm64: Move the LSE gas support detection to Kconfig 2020-01-15 12:50:48 +00:00
atomic_lse.h arm64: lse: fix LSE atomics with LLVM's integrated assembler 2020-01-16 17:25:10 +00:00
barrier.h arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros 2020-04-16 12:28:35 +01:00
bitops.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
bitrev.h
boot.h treewide: replace #include <asm/sizes.h> with #include <linux/sizes.h> 2019-05-14 19:52:52 -07:00
brk-imm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
bug.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
cache.h arm64: Ask the compiler to __always_inline functions used by KVM at HYP 2020-02-22 11:01:47 +00:00
cacheflush.h arm64: use asm-generic/cacheflush.h 2020-06-08 11:05:57 -07:00
checksum.h arm64: csum: Fix handling of bad packets 2020-07-30 17:01:38 +01:00
clocksource.h arm64: Introduce asm/vdso/clocksource.h 2020-03-21 15:23:55 +01:00
cmpxchg.h arm64: fix unreachable code issue with cmpxchg 2019-09-17 12:11:50 +01:00
compat.h compat: provide compat_ptr() on all architectures 2020-01-03 09:32:51 +01:00
compiler.h arm64: use a common .arch preamble for inline assembly 2020-08-28 11:15:15 +01:00
cpu.h arm64/cpuinfo: Add ID_MMFR4_EL1 into the cpuinfo_arm64 context 2020-05-21 15:47:12 +01:00
cpu_ops.h arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpucaps.h arm64: tlb: Detect the ARMv8.4 TLBI RANGE feature 2020-07-15 15:57:30 +01:00
cpufeature.h arm64 and cross-arch updates for 5.9: 2020-08-03 14:11:08 -07:00
cpuidle.h
cputype.h arm64: Add MIDR value for KRYO4XX gold CPU cores 2020-07-03 16:39:16 +01:00
current.h
daifflags.h arm64: acpi: fix DAIF manipulation with pNMI 2020-01-22 14:41:22 +00:00
dcc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
debug-monitors.h arm64: ptrace: Override SPSR.SS when single-stepping is enabled 2020-07-16 11:41:21 +01:00
device.h arm64: Remove dev->archdata.iommu pointer 2020-06-30 11:59:49 +02:00
dmi.h
efi.h efi/libstub: unify EFI call wrappers for non-x86 2020-04-23 20:15:06 +02:00
elf.h Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK 2020-06-05 13:45:21 -07:00
esr.h Merge branch 'for-next/bti-user' into for-next/bti 2020-05-05 15:15:58 +01:00
exception.h arm64: Basic Branch Target Identification support 2020-03-16 17:19:48 +00:00
exec.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
extable.h bpf, arm64: Add BPF exception tables 2020-07-31 00:43:40 +02:00
fb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
fixmap.h arm64/fixmap: make notes of fixed_addresses more precisely 2020-08-08 19:25:04 +01:00
fpsimd.h arm64: remove pointless __KERNEL__ guards 2019-08-05 11:06:33 +01:00
fpsimdmacros.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
ftrace.h arm64: implement ftrace with regs 2019-11-06 14:17:35 +00:00
futex.h futex: arch_futex_atomic_op_inuser() calling conventions change 2020-03-27 23:58:51 -04:00
hardirq.h arm64: Prepare arch_nmi_enter() for recursion 2020-05-19 15:51:17 +02:00
hugetlb.h arm64/hugetlb: Reserve CMA areas for gigantic pages on 16K and 64K configs 2020-07-15 13:38:03 +01:00
hw_breakpoint.h arm64: remove pointless __KERNEL__ guards 2019-08-05 11:06:33 +01:00
hwcap.h arm64: Reserve HWCAP2_MTE as (1 << 18) 2020-07-24 11:55:29 +01:00
hypervisor.h
image.h docs: arm64: convert docs to ReST and rename to .rst 2019-06-14 14:20:27 -06:00
insn.h arm64: insn: Provide a better name for aarch64_insn_is_nop() 2020-05-04 16:06:29 +01:00
io.h mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
irq.h
irq_work.h
irqflags.h arm64: Implement arch_irqs_disabled() 2020-08-26 12:41:55 +02:00
jump_label.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
kasan.h arm64: mm: Introduce vabits_actual 2019-08-09 11:17:21 +01:00
Kbuild KVM: arm64: Use common KVM implementation of MMU memory caches 2020-07-09 13:29:43 -04:00
kernel-pgtable.h arm64: Reduce the number of header files pulled into vmlinux.lds.S 2020-07-21 10:50:37 +01:00
kexec.h Revert "arm64: kexec: make dtb_mem always enabled" 2020-01-10 16:00:50 +00:00
kgdb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
kprobes.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
kvm_arm.h KVM: arm64: Set HCR_EL2.PTW to prevent AT taking synchronous exception 2020-08-28 15:27:47 +01:00
kvm_asm.h KVM: arm64: Survive synchronous exceptions caused by AT instructions 2020-08-28 15:23:46 +01:00
kvm_coproc.h KVM/arm64 updates for Linux 5.9: 2020-08-09 12:58:23 -04:00
kvm_emulate.h Merge branch 'kvm-arm64/misc-5.9' into kvmarm-master/next 2020-07-30 16:13:04 +01:00
kvm_host.h KVM/arm64 fixes for Linux 5.9, take #1 2020-09-11 13:12:11 -04:00
kvm_hyp.h KVM: arm64: Remove __hyp_text macro, use build rules instead 2020-07-05 18:38:45 +01:00
kvm_mmu.h KVM/arm64 updates for Linux 5.9: 2020-08-09 12:58:23 -04:00
kvm_ptrauth.h KVM: arm64: Simplify PtrAuth alternative patching 2020-06-22 11:42:50 +01:00
kvm_ras.h arm64: KVM/mm: Move SEA handling behind a single 'claim' interface 2019-02-07 23:10:45 +01:00
kvm_types.h KVM: arm64: Use common KVM implementation of MMU memory caches 2020-07-09 13:29:43 -04:00
linkage.h arm64: Don't insert a BTI instruction at inner labels 2020-06-24 14:24:29 +01:00
lse.h arm64: lse: Fix LSE atomics with LLVM 2020-02-18 18:10:49 +00:00
memory.h Merge branch 'for-next/read-barrier-depends' into for-next/core 2020-07-31 18:09:57 +01:00
mman.h arm64: Basic Branch Target Identification support 2020-03-16 17:19:48 +00:00
mmu.h KVM: arm64: Substitute RANDOMIZE_BASE for HARDEN_EL2_VECTORS 2020-07-28 10:41:11 +01:00
mmu_context.h arm64/mm: save memory access in check_and_switch_context() fast switch path 2020-07-30 12:58:40 +01:00
mmzone.h
module.h arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h> 2020-04-23 10:50:26 +09:00
neon-intrinsics.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
neon.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
numa.h
page-def.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
page.h mm/vma: define a default value for VM_DATA_DEFAULT_FLAGS 2020-04-10 15:36:21 -07:00
paravirt.h arm64: Retrieve stolen time as paravirtualized guest 2019-10-21 19:20:31 +01:00
pci.h arm64: remove pointless __KERNEL__ guards 2019-08-05 11:06:33 +01:00
percpu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
perf_event.h arm64: perf: Expose some new events via sysfs 2020-07-21 12:59:42 +01:00
pgalloc.h asm-generic: pgalloc: provide generic pgd_free() 2020-08-07 11:33:26 -07:00
pgtable-hwdef.h Merge branch 'for-next/tlbi' into for-next/core 2020-07-31 18:09:50 +01:00
pgtable-prot.h KVM: arm64: Fix definition of PAGE_HYP_DEVICE 2020-07-08 21:35:48 +01:00
pgtable-types.h arm64: add support for folded p4d page tables 2020-06-04 19:06:21 -07:00
pgtable.h arm64: tlb: Set the TTL field in flush_*_tlb_range 2020-07-07 11:23:47 +01:00
pointer_auth.h arm64: sync kernel APIAKey when installing 2020-04-21 15:52:56 +01:00
preempt.h sched/rt, arm64: Use CONFIG_PREEMPTION 2019-12-08 14:37:32 +01:00
probes.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
proc-fns.h arm64: mm: convert cpu_do_switch_mm() to C 2020-02-27 14:30:50 +00:00
processor.h arm64 updates for 5.7: 2020-03-31 10:05:01 -07:00
ptdump.h arm64: mm: convert mm/dump.c to use walk_page_range() 2020-02-04 03:05:25 +00:00
ptrace.h arm64: ptrace.h: delete duplicated word 2020-07-30 12:54:56 +01:00
pvclock-abi.h KVM: arm64: Implement PV_TIME_FEATURES call 2019-10-21 19:20:27 +01:00
scs.h scs: Move scs_overflow_check() out of architecture code 2020-05-18 17:47:40 +01:00
sdei.h arm64: Use the correct style for SPDX License Identifier 2019-04-16 16:28:01 +01:00
seccomp.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
sections.h arm64: Remove __exception_text_start and __exception_text_end from asm/section.h 2020-01-08 17:30:19 +00:00
shmparam.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
signal32.h arm64: remove pointless __KERNEL__ guards 2019-08-05 11:06:33 +01:00
simd.h arm64: fpsimd: Make sure SVE setup is complete before SIMD is used 2020-01-14 17:11:21 +00:00
smp.h - Fix tegra194-cpufreq module build failure caused __cpu_logical_map 2020-08-08 14:16:12 -07:00
smp_plat.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
sparsemem.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
spinlock.h arm64/spinlock: fix a -Wunused-function warning 2020-02-10 11:29:24 +00:00
spinlock_types.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
stack_pointer.h
stackprotector.h arm64: initialize ptrauth keys for kernel booting task 2020-03-18 09:50:20 +00:00
stacktrace.h arm64: add loglvl to dump_backtrace() 2020-06-09 09:39:11 -07:00
stage2_pgtable.h arm64: Add level-hinted TLB invalidation helper 2020-07-07 09:27:15 +01:00
stat.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
string.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
suspend.h arm64: Preserve register x18 when CPU is suspended 2020-05-15 16:35:50 +01:00
sync_bitops.h
syscall.h arm64: compat: Ensure upper 32 bits of x0 are zero on syscall return 2020-07-16 11:41:31 +01:00
syscall_wrapper.h arm64: simplify syscall wrapper ifdeffery 2019-10-14 10:55:00 +01:00
sysreg.h Merge branch 'for-next/tlbi' into for-next/core 2020-07-31 18:09:50 +01:00
system_misc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
thread_info.h arm64: ptrace: Consistently use pseudo-singlestep exceptions 2020-07-16 11:41:07 +01:00
timex.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
tlb.h arm64: tlb: Set the TTL field in flush_tlb_range 2020-07-07 11:23:47 +01:00
tlbflush.h arm64: use a common .arch preamble for inline assembly 2020-08-28 11:15:15 +01:00
topology.h arch_topology, arm, arm64: define arch_scale_freq_invariant() 2020-09-18 19:11:20 +02:00
traps.h arm64: remove __exception annotations 2019-10-28 11:22:38 +00:00
uaccess.h uaccess: remove segment_eq 2020-08-12 10:57:58 -07:00
unistd.h vfs: add faccessat2 syscall 2020-05-14 16:44:25 +02:00
unistd32.h all arch: remove system call sys_sysctl 2020-08-14 19:56:56 -07:00
uprobes.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vdso.h arm64/vdso: Add time namespace page 2020-07-24 13:15:20 +01:00
vermagic.h arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h> 2020-04-23 10:50:26 +09:00
virt.h KVM: arm64: Use build-time defines in has_vhe() 2020-07-05 18:38:01 +01:00
vmalloc.h mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h> 2019-12-10 10:12:55 +01:00
vmap_stack.h mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
word-at-a-time.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
xor.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00